Rear bumper for an automobile



FIG. 1 is a front elevation view of a rear bumper for an automobile in accordance with my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top, front, and right side perspective view thereof; and,

FIG. 7 is a bottom, front, and left side perspective view thereof.

The rear view of the rear bumper forms no part of the claimed design. 

CLAIM The ornamental design for a rear bumper for an automobile, as shown and described. 